Raise recording volume and zoom in on a free screen recorder

Since I started recording videos for youtube I have had many problems with recording volume. This video explores how you can raise recording volume on your computer for your screen recording. Also how could you zoom in on a free screen recorder. Many of the free screen recorders might not have this capability so how could you do this if like me you wanted to show some finer detail like some code to the viewer. This next video shows how you could do this with your computer even if your free screen recorder does not have a zoom in function.